NICMOS Parallel Thermal Background: Results from SMOV and Cycle 7

Details NICMOS Parallel Thermal Background: Results from SMOV and Cycle 7 NICMOS Parallel Thermal Background: Results from SMOV and Cycle 7

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nicm.rept...10d&link_type=abstract

Instrument Science Report NICMOS-98-010, 4 pages

Physics

Optics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

This ISR presents the results of the analysis of NICMOS parallel thermal background data obtained as part of both SMOV and the cycle 7 calibration plan. Parallel observations in NICMOS Camera 2 and Camera 3 are taken at different pointings and analysis of the data shows the HST thermal emission to be fairly stable, with an orbital variation of ~5% and a secular variation of ~8%. The secular variations are oscillations around the average over time scales of about one month. As expected, these oscillations are correlated with the temperature of the telescope’s optics. Background measurements are recommended when observing in the thermal filters, specially for images separated by large periods of time.

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